feat: add notification_channels in aiplatform v1beta1 model_monitoring.proto (#4160)

* feat: add notification_channels in aiplatform v1beta1 model_monitoring.proto

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Source-Link: googleapis/googleapis@a793ce3

Source-Link: googleapis/googleapis-gen@c904f38
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packages/google-cloud-aiplatform/protos/google/cloud/aiplatform/v1beta1/model_monitoring.proto

@@ -26,6 +26,10 @@ option java_outer_classname = "ModelMonitoringProto";
 option java_package = "com.google.cloud.aiplatform.v1beta1";
 option php_namespace = "Google\\Cloud\\AIPlatform\\V1beta1";
 option ruby_package = "Google::Cloud::AIPlatform::V1beta1";
+option (google.api.resource_definition) = {
+  type: "monitoring.googleapis.com/NotificationChannel"
+  pattern: "projects/{project}/notificationChannels/{notification_channel}"
+};
 
 // The model monitoring configuration used for Batch Prediction Job.
 message ModelMonitoringConfig {
@@ -208,6 +212,13 @@ message ModelMonitoringAlertConfig {
   // This can be further sinked to Pub/Sub or any other services supported
   // by Cloud Logging.
   bool enable_logging = 2;
+
+  // Resource names of the NotificationChannels to send alert.
+  // Must be of the format
+  // `projects/<project_id_or_number>/notificationChannels/<channel_id>`
+  repeated string notification_channels = 3 [(google.api.resource_reference) = {
+    type: "monitoring.googleapis.com/NotificationChannel"
+  }];
 }
 
 // The config for feature monitoring threshold.